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Diagnostic Tips
DME Fault P1688 – 2001-2006 Mini Cooper S
Diagnostic Tips

DME Fault P1688 – 2001-2006 Mini Cooper S

oemdtc November 20, 2016 1 Comment
SI M12 04 05
Engine Electrical Systems
July 2005
Technical Service

 

 


DME Fault P1688

 

MODEL

R52 (Cooper S Convertible) Equipped with W11 Engine R53 (Copper S) Equipped with W11 Engine

 

SITUATION

Customer complains of lack of power and engine is in failsafe mode. The Service Engine Soon light is illuminated and fault code P1688 (“Electronic throttle control monitor level 2/3; Mass air flow calculation”) is stored in the DME (EMSK2000 or MS5150).

 

CAUSE

This fault can be caused by one of the following:

  • Possible air leak in the induction system.
  • MAP Sensors are indicating implausible values.
  • Failure of the Supercharger By-Pass Valve (sticking operation).

 

PROCEDURE

  1. Check the complete air intake system including throttle body, supercharger, intercooler and inlet manifold for air leaks.
  2. If no problem is found, verify both of the manifold pressure sensors show plausible values. If values are not plausible, refer to MAP Sensor test module.
  3. If values are plausible, replace the Supercharger By-Pass Valve (PN 11 61 1 501 937) and reprogram the DME.

 

The success of the repair can be checked after each step by completing a special test drive:

Drive the vehicle in first gear increasing the engine speed to 5500 RPM. Shift into second gear, again increasing the engine speed to 5500 RPM. Once 5500 RPM has been achieved, slowly release the throttle until the RPM decreases to 3500RPM. Accelerate the vehicle again, increasing the engine speed to 5500 RPM and release slowly once again to 3500 RPM. Repeat the RPM swing between 3500 RPM and 5500 RPM four consecutive times and drive the vehicle normally back to your facility. If the fault has not returned, the vehicle is repaired.

Please adhere to all traffic regulations while performing the special test drive.

 

WARRANTY INFORMATION

Information Only

 

M12-04-05

 


 

Introduction

The Online Service System (OSS) has been developed specifically for independent automotive workshops to provide an extensive range of resources. The following applications are available in the OSS:

ISTA Diagnosis Application

Vehicle diagnostics from the Z3/E36, with the BMW ICOM, or with a J2534 pass-thru tool (from model year 1996).

  • Fault Code Diagnosis
  • Test Plans
  • Repair Instructions (E30 or higher)
  • Technical Data
  • Wiring diagrams

Web ISTA Information Application

WebISTA has been developed to provide an information only application for users that do not require all of the services included in the ISTA diagnostics application.

  • Repair Instructions (E30 or higher)
  • Technical Data
  • Tightening torques
  • Wiring diagrams

You can search using document title, document number and subject areas as the search criteria. The desired information is displayed by means of graphics and explanatory text.

ISTA/P Online – Control Module Reprogramming

With ISTA/P you can reprogram the onboard control modules that are capable of software reprogramming.  For ISTA/P, a data interface, a power supply and an Internet connection are required. The data interface can be a BMW Group ICOM interface or a “Pass-Thru Tool (PTT)” that fulfills the requirements of the SAE J2534 standard.

What is needed to diagnose and program with the BMW OSS?

The OSS consists of a desktop or laptop PC connected to BMW over the Internet. To connect to the vehicle you can use the BMW authorized diagnostic interface “integrated communication optical module (ICOM)” or use a J2534 “Pass Thru Tool (PTT)”.   

Note

Connection to OSS works only on PCs where no proxy connections are used.

For information about vehicle reprogramming and diagnostics using J2534 click here.

 

 

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About The Author

oemdtc

Tags:2001 2002 2003 2004 2005 2006 Cooper S MINI P1688

One Response

  1. BERTOUT

    Hi,

    Please add to possible cause :
    Damper crankshaft pulley failure (cracked rubber or not well bolted).

    Because if it’s failing, the belt isn’t well moved, so supercharger (and water pump) too.

    October 5, 2017

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